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JP2020107464A - Secondary battery and battery pack - Google Patents

Secondary battery and battery pack Download PDF

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Publication number
JP2020107464A
JP2020107464A JP2018244433A JP2018244433A JP2020107464A JP 2020107464 A JP2020107464 A JP 2020107464A JP 2018244433 A JP2018244433 A JP 2018244433A JP 2018244433 A JP2018244433 A JP 2018244433A JP 2020107464 A JP2020107464 A JP 2020107464A
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negative electrode
conductive member
secondary battery
external conductive
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JP7296208B2 (en
Inventor
陽平 室屋
Yohei Muroya
陽平 室屋
高林　洋志
Hiroshi Takabayashi
洋志 高林
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Priority to JP2018244433A priority Critical patent/JP7296208B2/en
Priority to CN201911218085.XA priority patent/CN111384355B/en
Priority to US16/705,447 priority patent/US11424517B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/517—Methods for interconnecting adjacent batteries or cells by fixing means, e.g. screws, rivets or bolts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

To provide a secondary battery and a battery pack with a highly reliable connection between a terminal and an external conductive member.SOLUTION: A negative terminal 9 includes a flange 9a, and a connection portion 9b provided on a first surface 91 of the flange portion 9a, and the connection portion 9b is inserted into a terminal mounting hole, the negative electrode terminal 9 includes a first region 101 made of aluminum or an aluminum alloy and a second region 102 made of copper or a copper alloy, and in the flange portion 9a, a second area 102 is arranged on the first surface 91 side, a first area 101 is arranged on the second surface 92 side, and a boundary 103 between the first area 101 and the second area 102 is arranged between the first surface 91 and the second surface 92, and in the flange portion 9a, the thickness of the first area 101 of a portion where the thickness of the first area 101 in the thickness direction of the flange portion 9a is the smallest is 0.3 mm or more, and an external conductive member 15 made of aluminum or aluminum alloy is welded to the flange portion 9a to form a welded portion.SELECTED DRAWING: Figure 4

Description

本発明は、二次電池及び組電池に関する。 The present invention relates to a secondary battery and an assembled battery.

リチウムイオン二次電池等の二次電池は、ハイブリッド電気自動車（ＰＨＥＶ、ＨＥＶ）や電気自動車(ＥＶ)の駆動用電源等に利用されている。駆動用電源においては、複数の二次電池が直列ないし並列接続された組電池として利用される。組電池において隣接する二次電池同士はバスバーによって電気的に接続される。 A secondary battery such as a lithium ion secondary battery is used as a drive power source for a hybrid electric vehicle (PHEV, HEV) or an electric vehicle (EV). The driving power source is used as an assembled battery in which a plurality of secondary batteries are connected in series or in parallel. Secondary batteries adjacent to each other in the assembled battery are electrically connected to each other by a bus bar.

二次電池において、正極芯体及び正極集電体としてアルミニウム系金属が用いられ、負極芯体及び負極集電体として銅系金属が汎用的に用いられる。また、正極端子に溶接される正極外部導電部材の材料にはアルミニウム系金属が用いられ、負極端子に溶接される負極外部導電部材には銅系金属が用いられる（特許文献１参照）。 In a secondary battery, an aluminum-based metal is used for the positive electrode core and the positive electrode current collector, and a copper-based metal is generally used for the negative electrode core and the negative electrode current collector. Aluminum-based metal is used for the material of the positive electrode external conductive member welded to the positive electrode terminal, and copper-based metal is used for the negative electrode external conductive member welded to the negative electrode terminal (see Patent Document 1).

特開２０１３−１５７１３０号公報JP, 2013-157130, A

本発明は、二次電池の端子と外部導電部材との接続部の信頼性に優れた二次電池及びそれを用いた組電池を提供することを一つの目的とする。 It is an object of the present invention to provide a secondary battery having excellent reliability of a connecting portion between a terminal of the secondary battery and an external conductive member, and an assembled battery using the secondary battery.

本発明の一形態の二次電池は、
正極板と負極板を含む電極体と、
開口を有し、前記電極体を収容する外装体と、
前記開口を封口する封口板と、
前記正極板又は前記負極板に電気的に接続された端子と、を備えた二次電池であって、
前記封口板は端子取り付け孔を有し、
前記端子は、第１面と前記第１面とは反対側に位置する第２面とを有するフランジ部と、前記第１面に設けられた接続部を有し、
前記接続部は前記端子取り付け孔に挿入され、
前記端子は、アルミニウム又はアルミニウム合金からなる第１領域と、銅又は銅合金からなる第２領域を有し、
前記フランジ部において、前記第１面側に前記第２領域が配置され、前記第２面側に前記第１領域が配置され、
前記第１領域と前記第２領域の境界の少なくとも一部が前記第１面と前記第２面の間に配置され、
前記フランジ部において、前記フランジ部の厚み方向における前記第１領域の厚みが最も小さい部分の前記第１領域の厚みが０．３ｍｍ以上であり、
前記フランジ部上にアルミニウム又はアルミニウム合金製の外部導電部材が配置され、
前記外部導電部材が前記フランジ部に溶接されて溶接部が形成されている。 A secondary battery according to one aspect of the present invention is
An electrode body including a positive electrode plate and a negative electrode plate,
An exterior body having an opening and accommodating the electrode body,
A sealing plate for sealing the opening,
A secondary battery comprising a terminal electrically connected to the positive electrode plate or the negative electrode plate,
The sealing plate has a terminal mounting hole,
The terminal has a flange portion having a first surface and a second surface located on the opposite side of the first surface, and a connecting portion provided on the first surface,
The connection portion is inserted into the terminal mounting hole,
The terminal has a first region made of aluminum or an aluminum alloy and a second region made of copper or a copper alloy,
In the flange portion, the second region is arranged on the first surface side, and the first region is arranged on the second surface side,
At least a part of a boundary between the first area and the second area is arranged between the first surface and the second surface,
In the flange portion, the thickness of the first region in the portion where the thickness of the first region in the thickness direction of the flange portion is the smallest is 0.3 mm or more,
An external conductive member made of aluminum or aluminum alloy is arranged on the flange portion,
The outer conductive member is welded to the flange portion to form a welded portion.

本発明の一形態の組電池は、前記二次電池を複数含む。本発明の一形態の組電池において前記二次電池は直列ないし並列に接続される。 An assembled battery according to one aspect of the present invention includes a plurality of the secondary batteries. In the assembled battery according to one aspect of the present invention, the secondary batteries are connected in series or in parallel.

本発明の一形態によると、端子と外部導電部材の接続部の信頼性が高い二次電池及びそれを用いた組電池となる。 According to one aspect of the present invention, a secondary battery having a highly reliable connecting portion between a terminal and an external conductive member and an assembled battery using the secondary battery are provided.

実施形態に係る二次電池の斜視図である。It is a perspective view of the secondary battery concerning an embodiment. 実施形態に係る二次電池の正面図であり、外装体の側壁及び絶縁シートを取り除いた図である。FIG. 3 is a front view of the secondary battery according to the embodiment, in which the side wall of the exterior body and the insulating sheet are removed. 封口板の長手方向に沿った正極端子近傍の断面図である。It is sectional drawing of the positive electrode terminal vicinity along the longitudinal direction of a sealing plate. 封口板の長手方向に沿った負極端子近傍の断面図である。It is sectional drawing of the negative electrode terminal vicinity along the longitudinal direction of the sealing plate. 図４における負極端子と外部導電部材の溶接部近傍の拡大図である。FIG. 5 is an enlarged view of the vicinity of a welded portion between the negative electrode terminal and the external conductive member in FIG. 4. 封口板の短手方向に沿った負極端子近傍の断面図である。It is sectional drawing of the negative electrode terminal vicinity along the lateral direction of a sealing plate. 負極端子と外部導電部材の近傍の平面図である。FIG. 6 is a plan view of the vicinity of a negative electrode terminal and an external conductive member. 実施形態に係る組電池を示す図である。It is a figure which shows the assembled battery which concerns on embodiment. 他の実施形態に係る組電池を示す図である。It is a figure which shows the assembled battery which concerns on other embodiment.

以下に本発明に係る実施形態を詳細に説明する。但し、本発明は、以下の形態に限定されない。 Hereinafter, embodiments according to the present invention will be described in detail. However, the present invention is not limited to the following modes.

まず、図１〜図４を用いて実施形態に係る角形の二次電池５０の構成を説明する。二次電池５０は、開口を有する角形の有底筒状の外装体１と、外装体１の開口を封口する封口板２を有する。外装体１と封口板２により電池ケース２００が構成される。外装体１及び封口板２は金属製であることが好ましく、アルミニウム又はアルミニウム合金製であることがより好ましい。 First, the configuration of the prismatic secondary battery 50 according to the embodiment will be described with reference to FIGS. 1 to 4. The secondary battery 50 includes a prismatic bottomed cylindrical outer casing 1 having an opening, and a sealing plate 2 for sealing the opening of the outer casing 1. The outer case 1 and the sealing plate 2 form a battery case 200. The outer casing 1 and the sealing plate 2 are preferably made of metal, and more preferably made of aluminum or aluminum alloy.

外装体１には、帯状の正極板と帯状の負極板が帯状のセパレータを介して巻回された偏平状の巻回電極体３と非水電解液が収容されている。巻回電極体３は、一方の端部に巻回された正極芯体露出部４を有し、他方の端部に巻回された負極芯体露出部５を有する。巻回電極体３と外装体１の間には樹脂製の絶縁シート２０が配置されている。 The outer casing 1 contains a flat wound electrode body 3 in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound via a strip-shaped separator, and a nonaqueous electrolytic solution. The spirally wound electrode body 3 has a positive electrode core exposed portion 4 wound at one end and a negative electrode core exposed portion 5 wound at the other end. An insulating sheet 20 made of resin is disposed between the wound electrode body 3 and the outer casing 1.

正極芯体露出部４には正極集電体６が接続され、正極集電体６と正極端子７が電気的に接続されている。正極集電体６と封口板２の間には内部側絶縁部材１０が配置され、正極端子７と封口板２の間には外部側絶縁部材１２が配置されている。電池ケース２００外において、正極端子７に外部導電部材１４が接続されている。外部導電部材１４にはボルト部１６が設けられている。外部導電部材１４と封口板２の間には絶縁部材１８が配置されている。 The positive electrode current collector 6 is connected to the positive electrode core exposed portion 4, and the positive electrode current collector 6 and the positive electrode terminal 7 are electrically connected. An inner insulating member 10 is arranged between the positive electrode current collector 6 and the sealing plate 2, and an outer insulating member 12 is arranged between the positive electrode terminal 7 and the sealing plate 2. Outside the battery case 200, the external conductive member 14 is connected to the positive electrode terminal 7. The external conductive member 14 is provided with a bolt portion 16. An insulating member 18 is arranged between the outer conductive member 14 and the sealing plate 2.

負極芯体露出部５には負極集電体８が接続され、負極集電体８と負極端子９が電気的に接続されている。負極集電体８と封口板２の間には内部側絶縁部材１１が配置され、負極端子９と封口板２の間には外部側絶縁部材１３が配置されている。電池ケース２００外において、負極端子９に外部導電部材１５が接続されている。外部導電部材１５にはボルト部１７が設けられている。外部導電部材１５と封口板２の間には絶縁部材１９が配置されている。 A negative electrode current collector 8 is connected to the negative electrode core body exposed portion 5, and the negative electrode current collector 8 and the negative electrode terminal 9 are electrically connected. An inner insulating member 11 is arranged between the negative electrode current collector 8 and the sealing plate 2, and an outer insulating member 13 is arranged between the negative electrode terminal 9 and the sealing plate 2. Outside the battery case 200, the external conductive member 15 is connected to the negative electrode terminal 9. A bolt portion 17 is provided on the external conductive member 15. An insulating member 19 is arranged between the external conductive member 15 and the sealing plate 2.

封口板２には、電池ケース２００内の圧力が所定値以上となった時に破断し、電池ケース２００内のガスを電池ケース２００外に排出するガス排出弁２１が設けられている。また、封口板２には、電解液注液孔が形成されている。この電解液注液孔は電池ケース２００内に非水電解液を注液した後、封止部材２３により封止される。 The sealing plate 2 is provided with a gas discharge valve 21 that breaks when the pressure inside the battery case 200 exceeds a predetermined value and discharges the gas inside the battery case 200 to the outside of the battery case 200. Further, the sealing plate 2 is formed with an electrolyte solution injection hole. The electrolyte injection hole is sealed by the sealing member 23 after injecting the non-aqueous electrolyte into the battery case 200.

次に、二次電池５０の詳細構成について説明する Next, the detailed configuration of the secondary battery 50 will be described.

[正極板]
正極板は、正極芯体としての金属箔の両面に正極活物質層が形成されたものであることが好ましい。正極芯体としては、アルミニウム箔又はアルミニウム合金箔が好ましい。正極活物質はリチウムイオンの吸蔵と放出が可能なリチウム遷移金属酸化物であることが好ましい。正極活物質層は、正極活物質、炭素材料等の導電材、及びバインダーを含むことが好ましい。 [Positive plate]
The positive electrode plate is preferably one in which a positive electrode active material layer is formed on both sides of a metal foil as a positive electrode core. The positive electrode core is preferably an aluminum foil or an aluminum alloy foil. The positive electrode active material is preferably a lithium transition metal oxide capable of inserting and extracting lithium ions. The positive electrode active material layer preferably contains a positive electrode active material, a conductive material such as a carbon material, and a binder.

[負極板]
負極板は、負極芯体としての金属箔の両面に負極活物質層が形成されたものであることが好ましい。負極芯体としては、銅箔又は銅合金箔が好ましい。負極活物質は、黒鉛等の炭素材料、シリコン材料であることが好ましい。負極活物質層は、負極活物質、及びバインダーを含むことが好ましい。必要に応じて負極活物質層に導電材を含有させることもできる。 [Negative electrode plate]
It is preferable that the negative electrode plate has a negative electrode active material layer formed on both surfaces of a metal foil as a negative electrode core. As the negative electrode core, copper foil or copper alloy foil is preferable. The negative electrode active material is preferably a carbon material such as graphite or a silicon material. The negative electrode active material layer preferably contains a negative electrode active material and a binder. If necessary, the negative electrode active material layer may contain a conductive material.

[電極体]
幅方向における一方の端部に正極芯体露出部４を有する帯状の正極板と、幅方向における一方の端部に負極芯体露出部５を有する帯状の負極板を、帯状のセパレータを介して巻回することにより偏平状の巻回電極体３とすることができる。なお、電極体は、複数枚の正極板と複数枚の負極板を含む積層型電極体であってもよい。 [Electrode body]
A strip-shaped positive electrode plate having a positive electrode core exposed portion 4 at one end in the width direction, and a strip negative electrode plate having a negative electrode core exposed portion 5 at one end in the width direction, with a strip separator interposed therebetween. By winding, the flat wound electrode body 3 can be obtained. The electrode body may be a laminated electrode body including a plurality of positive electrode plates and a plurality of negative electrode plates.

[非水電解質]
非水電解質としては、非水溶媒に電解質を溶解させた非水電解液を用いることができる。非水溶媒及び電解質は公知のものを使用できる。なお、非水電解質は、固体状、ゲル状であってもよい。 [Non-aqueous electrolyte]
As the non-aqueous electrolyte, a non-aqueous electrolyte solution obtained by dissolving an electrolyte in a non-aqueous solvent can be used. Known non-aqueous solvents and electrolytes can be used. The non-aqueous electrolyte may be solid or gel.

[正極側の導電経路]
図３は、封口板２の長手方向に沿った正極端子７近傍の断面図である。封口板２の正極端子取り付け孔２ａの周囲において、内面側に樹脂製の内部側絶縁部材１０及び正極集電体６を配置する。また、封口板２の正極端子取り付け孔２ａの周囲において、外面側に樹脂製の外部側絶縁部材１２を配置する。そして、正極端子７を、外部側絶縁部材１２、封口板２の正極端子取り付け孔２ａ、内部側絶縁部材１０の貫通孔及び正極集電体６の貫通孔に挿入し、正極端子７の先端を正極集電体６上にカシメる。これにより、正極集電体６及び正極端子７が封口板２に固定される。なお、正極端子７においてカシメされた部分を正極集電体６に溶接して溶接部６０を形成することが好ましい。 [Conductive path on the positive electrode side]
FIG. 3 is a cross-sectional view of the vicinity of the positive electrode terminal 7 along the longitudinal direction of the sealing plate 2. A resin inner side insulating member 10 and a positive electrode current collector 6 are arranged on the inner surface side around the positive electrode terminal mounting hole 2a of the sealing plate 2. Further, a resin-made outer insulating member 12 is arranged on the outer surface side around the positive electrode terminal mounting hole 2a of the sealing plate 2. Then, the positive electrode terminal 7 is inserted into the outer insulating member 12, the positive electrode terminal mounting hole 2a of the sealing plate 2, the through hole of the inner insulating member 10 and the through hole of the positive electrode current collector 6, and the tip of the positive electrode terminal 7 is inserted. Crim on the positive electrode current collector 6. As a result, the positive electrode current collector 6 and the positive electrode terminal 7 are fixed to the sealing plate 2. It is preferable that the crimped portion of the positive electrode terminal 7 is welded to the positive electrode current collector 6 to form the welded portion 60.

正極端子７には、外部導電部材１４が溶接され溶接部６１が形成される。外部導電部材１４にはボルト部１６が設けられている。ボルト部１６は、外部導電部材１４と、他の二次電池５０の外部導電部材を電気的に接続するバスバーを固定するために用いられる。外部導電部材１４と封口板２の間には樹脂製の絶縁部材１８が配置される。 The external conductive member 14 is welded to the positive electrode terminal 7 to form a welded portion 61. The external conductive member 14 is provided with a bolt portion 16. The bolt portion 16 is used to fix the bus bar that electrically connects the external conductive member 14 and the external conductive member of the other secondary battery 50. An insulating member 18 made of resin is arranged between the external conductive member 14 and the sealing plate 2.

正極集電体６、正極端子７、外部導電部材１４はそれぞれ金属製であり、アルミニウム又はアルミニウム合金製であることが好ましい。ボルト部１６は金属製であることが好ましい。正極集電体６、正極端子７、外部導電部材１４はそれぞれ封口板２と電気的に絶縁されている。 Each of the positive electrode current collector 6, the positive electrode terminal 7, and the external conductive member 14 is made of metal, and is preferably made of aluminum or aluminum alloy. The bolt portion 16 is preferably made of metal. The positive electrode current collector 6, the positive electrode terminal 7, and the external conductive member 14 are electrically insulated from the sealing plate 2.

[負極側の導電経路]
図４は、封口板２の長手方向に沿った負極端子９近傍の断面図である。封口板２の負極端子取り付け孔２ｂの周囲において、内面側に樹脂製の内部側絶縁部材１１及び負極集電
体８を配置する。また、封口板２の負極端子取り付け孔２ｂの周囲において、外面側に樹脂製の外部側絶縁部材１３を配置する。そして、負極端子９を、外部側絶縁部材１３、封口板２の負極端子取り付け孔２ｂ、内部側絶縁部材１１の貫通孔及び負極集電体８の貫通孔に挿入し、負極端子９の先端を負極集電体８上にカシメる。これにより、負極集電体８及び負極端子９が封口板２に固定される。なお、負極端子９においてカシメされた部分を負極集電体８に溶接して溶接部６２を形成することが好ましい。 [Conductive path on the negative electrode side]
FIG. 4 is a cross-sectional view of the vicinity of the negative electrode terminal 9 along the longitudinal direction of the sealing plate 2. A resin inner side insulating member 11 and a negative electrode current collector 8 are arranged on the inner surface around the negative electrode terminal mounting hole 2b of the sealing plate 2. Further, a resin-made outer insulating member 13 is arranged on the outer surface side around the negative electrode terminal mounting hole 2b of the sealing plate 2. Then, the negative electrode terminal 9 is inserted into the external insulating member 13, the negative electrode terminal mounting hole 2b of the sealing plate 2, the through hole of the internal insulating member 11 and the through hole of the negative electrode current collector 8, and the tip of the negative electrode terminal 9 is inserted. Crim on the negative electrode current collector 8. As a result, the negative electrode current collector 8 and the negative electrode terminal 9 are fixed to the sealing plate 2. The crimped portion of the negative electrode terminal 9 is preferably welded to the negative electrode current collector 8 to form the welded portion 62.

負極端子９には、外部導電部材１５が溶接され溶接部６３が形成される。外部導電部材１５にはボルト部１７が設けられている。ボルト部１７は、外部導電部材１５と、他の二次電池５０の外部導電部材を電気的に接続するバスバーを固定するために用いられる。外部導電部材１５と封口板２の間には樹脂製の絶縁部材１９が配置される。 The external conductive member 15 is welded to the negative electrode terminal 9 to form a welded portion 63. A bolt portion 17 is provided on the external conductive member 15. The bolt portion 17 is used to fix the bus bar that electrically connects the external conductive member 15 and the external conductive member of the other secondary battery 50. An insulating member 19 made of resin is arranged between the external conductive member 15 and the sealing plate 2.

負極集電体８は銅又は銅合金製であることが好ましい。外部導電部材１５はアルミニウム又はアルミニウム製であることが好ましい。外部導電部材１５をアルミニウム又はアルミニウム合金製とすることで二次電池５０及びそれを用いた組電池を軽量化できる。また、アルミニウム又はアルミニウム合金製のバスバーを用いる場合、外部導電部材１５とバスバーの接続を同種金属間の接続とすることができるため、外部導電部材１５とバスバーの接続部の信頼性が向上する。 The negative electrode current collector 8 is preferably made of copper or a copper alloy. The outer conductive member 15 is preferably made of aluminum or aluminum. By making the external conductive member 15 from aluminum or an aluminum alloy, the weight of the secondary battery 50 and the assembled battery using the secondary battery 50 can be reduced. Further, when the bus bar made of aluminum or aluminum alloy is used, the connection between the external conductive member 15 and the bus bar can be made between the same metals, so that the reliability of the connecting portion between the external conductive member 15 and the bus bar is improved.

図４及び図５に示すように、負極端子９はフランジ部９ａを有する。フランジ部９ａは、第１面９１と、第１面９１と反対側に位置する第２面９２と、第１面９１と第２面９２を繋ぐ側面９３を有する。フランジ部９ａの第１面９１には接続部９ｂが設けられている。フランジ部９ａの外径は、封口板２の負極端子取り付け孔２ｂの内径よりも大きい。フランジ部９ａの外径は、接続部９ｂの外径よりも大きい。接続部９ｂは、封口板２に設けられた負極端子取り付け孔２ｂに挿入されている。接続部９ｂの先端部が負極集電体８上にカシメされている。接続部９ｂには凹部９ｃが設けられている。フランジ部９ａの第２面９２に突部９ｄが設けられている。なお、突部９ｄを設けなくてもよい。 As shown in FIGS. 4 and 5, the negative electrode terminal 9 has a flange portion 9a. The flange portion 9 a has a first surface 91, a second surface 92 located on the opposite side of the first surface 91, and a side surface 93 connecting the first surface 91 and the second surface 92. A connection portion 9b is provided on the first surface 91 of the flange portion 9a. The outer diameter of the flange portion 9a is larger than the inner diameter of the negative electrode terminal mounting hole 2b of the sealing plate 2. The outer diameter of the flange portion 9a is larger than the outer diameter of the connecting portion 9b. The connecting portion 9b is inserted into the negative electrode terminal mounting hole 2b provided in the sealing plate 2. The tip of the connecting portion 9b is crimped onto the negative electrode current collector 8. The connecting portion 9b is provided with a recess 9c. A protrusion 9d is provided on the second surface 92 of the flange 9a. The protrusion 9d may not be provided.

アルミニウム又はアルミニウム合金製の外部導電部材１５は、フランジ部９ａ上に配置されている。外部導電部材１５とフランジ部９ａは溶接され、溶接部６３が形成されている。外部導電部材１５は薄肉部１５ｂを有し、薄肉部１５ｂがフランジ部９ａに溶接されている。外部導電部材１５は貫通孔１５ａを有する。負極端子９の突部９ｄは、貫通孔１５ａ内に配置されている。薄肉部１５ｂは、貫通孔１５ａの縁部近傍に形成されている。 The external conductive member 15 made of aluminum or aluminum alloy is arranged on the flange portion 9a. The outer conductive member 15 and the flange portion 9a are welded to each other to form a welded portion 63. The external conductive member 15 has a thin portion 15b, and the thin portion 15b is welded to the flange portion 9a. The external conductive member 15 has a through hole 15a. The protrusion 9d of the negative electrode terminal 9 is arranged in the through hole 15a. The thin portion 15b is formed near the edge of the through hole 15a.

負極端子９は、アルミニウム又はアルミニウム合金からなる第１領域１０１と、銅又は銅合金からなる第２領域１０２を有する。第１領域１０１は第２面９２側に位置し、第２領域１０２は第１面９１側に位置している。第１領域１０１と第２領域１０２の境界１０３は、フランジ部９ａの側面９３からフランジ部９ａの中央側に延びている。負極端子９の中央部（負極端子９の中心軸９ｘの近傍）においては、境界１０３は、フランジ部９ａの第１面９１よりも接続部９ｂの先端側（図５においては下方側）に位置する。 The negative electrode terminal 9 has a first region 101 made of aluminum or an aluminum alloy and a second region 102 made of copper or a copper alloy. The first area 101 is located on the second surface 92 side, and the second area 102 is located on the first surface 91 side. The boundary 103 between the first region 101 and the second region 102 extends from the side surface 93 of the flange portion 9a toward the center of the flange portion 9a. In the central portion of the negative electrode terminal 9 (in the vicinity of the central axis 9x of the negative electrode terminal 9), the boundary 103 is located closer to the tip end side (lower side in FIG. 5) of the connecting portion 9b than the first surface 91 of the flange portion 9a. To do.

境界１０３は、フランジ部９ａの側面９３から負極端子９の中心軸９ｘに向けて第１領域１０１の厚みが徐々に小さくなる領域と、負極端子９の中心軸９ｘに向けて第１領域１０１の厚みが徐々に大きくなる領域が形成されるように配置されている。そして、接続部９ｂにおいて境界１０３は、中央部が第２面９２側に突出する凸状に形成されている。凸状に形成されている部分は、湾曲した凸状となっている。 The boundary 103 includes a region where the thickness of the first region 101 gradually decreases from the side surface 93 of the flange portion 9a toward the central axis 9x of the negative electrode terminal 9 and a region of the first region 101 toward the central axis 9x of the negative electrode terminal 9. It is arranged so that a region having a gradually increasing thickness is formed. Then, in the connecting portion 9b, the boundary 103 is formed in a convex shape whose central portion projects toward the second surface 92 side. The portion formed in a convex shape has a curved convex shape.

フランジ部９ａは、接続部９ｂの根元部分に、外周部の厚みよりも厚みの大きい肉厚部９ｅを有する。肉厚部９ｅは、第１面９１から部分的に封口板２側に突出した状態となっている。肉厚部９ｅが形成されていることにより、負極端子９の導電性を向上させること
ができる。よって、より出力特性に優れた二次電池となる。また、負極端子９の発熱を抑制できるため、外部側絶縁部材１３の劣化を抑制できる。 The flange portion 9a has a thick portion 9e, which is thicker than the thickness of the outer peripheral portion, at the root portion of the connecting portion 9b. The thick portion 9e is in a state of partially protruding from the first surface 91 toward the sealing plate 2 side. Since the thick portion 9e is formed, the conductivity of the negative electrode terminal 9 can be improved. Therefore, the secondary battery has more excellent output characteristics. Further, since the heat generation of the negative electrode terminal 9 can be suppressed, the deterioration of the outer insulating member 13 can be suppressed.

アルミニウム又はアルミニウム合金からなる外部導電部材１５は、負極端子９においてアルミニウム又はアルミニウム合金からなる第１領域１０１に接続されている。また、銅又は銅合金からなる負極集電体８は、負極端子９において銅又は銅合金製の第２領域１０２と接続されている。したがって、外部導電部材１５と負極端子９が同種の金属間で接続され、負極集電体８と負極端子９が同種の金属間で接続されている。したがって、外部導電部材１５と負極端子９の接続部、負極集電体８と負極端子９の接続部のそれぞれが強固であり信頼性の高いものとなる。 The external conductive member 15 made of aluminum or aluminum alloy is connected to the first region 101 made of aluminum or aluminum alloy at the negative electrode terminal 9. The negative electrode current collector 8 made of copper or a copper alloy is connected to the second region 102 made of copper or a copper alloy at the negative electrode terminal 9. Therefore, the external conductive member 15 and the negative electrode terminal 9 are connected between the same kind of metal, and the negative electrode current collector 8 and the negative electrode terminal 9 are connected between the same kind of metal. Therefore, the connection between the external conductive member 15 and the negative electrode terminal 9 and the connection between the negative electrode current collector 8 and the negative electrode terminal 9 are both strong and highly reliable.

ここで、外部導電部材１５と負極端子９の第１領域１０１の間に形成された溶接部６３が、負極端子９の第２領域１０２まで達した場合、アルミ系金属と銅系金属の間の異種金属間接合となるため、外部導電部材１５と負極端子９の接合強度、及び第１領域１０１と第２領域１０２の接合強度が低下する虞がある。したがって、溶接部６３は、負極端子９の第２領域１０２に達していないことが好ましい。 Here, when the welded portion 63 formed between the external conductive member 15 and the first region 101 of the negative electrode terminal 9 reaches the second region 102 of the negative electrode terminal 9, between the aluminum-based metal and the copper-based metal. Since the dissimilar metals are bonded, the bonding strength between the external conductive member 15 and the negative electrode terminal 9 and the bonding strength between the first region 101 and the second region 102 may decrease. Therefore, it is preferable that the welded portion 63 does not reach the second region 102 of the negative electrode terminal 9.

外部導電部材１５と負極端子９の第１領域１０１の接合強度を確保し、且つ、溶接部６３が負極端子９の第２領域１０２に達しないようにするためには、フランジ部９ａにおいて、第１領域１０１の厚みが最も小さい部分の第１領域１０１の厚みＴ１を０．３ｍｍ以上とすることが好ましい。これにより、負極端子９の第１領域１０１に形成される溶接部６３の位置がずれた場合であっても、外部導電部材１５と負極端子９の接合強度を確保し、且つ、溶接部６３が負極端子９の第２領域１０２に達することを防止できる。
また、フランジ部９ａにおいて、第１領域１０１の厚みが最も小さい部分よりも負極端子９の中心軸９ｘに近い領域に溶接部６３が形成されるようにすることが好ましい。これにより、溶接部６３が負極端子９の第２領域１０２に達することを効果的に防止できる。
なお、フランジ部９ａにおいて、第１領域１０１の厚みが最も小さい部分の第１領域１０１の厚みＴ１を０．５ｍｍ以上とすることがより好ましい。 In order to secure the bonding strength between the external conductive member 15 and the first region 101 of the negative electrode terminal 9 and prevent the welded portion 63 from reaching the second region 102 of the negative electrode terminal 9, the flange portion 9a has It is preferable that the thickness T1 of the first region 101 at the portion where the thickness of the first region 101 is smallest is 0.3 mm or more. Thereby, even if the position of the welded portion 63 formed in the first region 101 of the negative electrode terminal 9 is displaced, the bonding strength between the external conductive member 15 and the negative electrode terminal 9 is ensured, and the welded portion 63 is It can prevent reaching the second region 102 of the negative electrode terminal 9.
Further, it is preferable that the welded portion 63 is formed in the flange portion 9a in a region closer to the central axis 9x of the negative electrode terminal 9 than in the portion where the first region 101 has the smallest thickness. This can effectively prevent the welded portion 63 from reaching the second region 102 of the negative electrode terminal 9.
In addition, in the flange portion 9a, it is more preferable that the thickness T1 of the first region 101 of the portion where the thickness of the first region 101 is the smallest is 0.5 mm or more.

外部導電部材１５に貫通孔１５ａを設けることにより、外部導電部材１５と負極端子９を溶接接続する際に、外部導電部材１５と負極端子９のフランジ部９ａの間に隙間が生じていないことを確認できるため、溶接部６３を安定的に形成できる。よって、溶接部６３が負極端子９の第２領域１０２に達しないように確実に制御できる。
また、外部導電部材１５の薄肉部１５ｂに溶接部６３を形成することにより、溶接部６３が負極端子９の第２領域１０２に達しないように確実に制御できる。なお、薄肉部１５ｂの厚みは、突部９ｄの高さよりも小さいことが好ましい。
外部導電部材１５の厚み（薄肉部１５ｂの周囲の厚み）は、突部９ｄの高さより大きいことが好ましい。このような構成であると、溶接部６３が他の部材等に接触し溶接部６３が損傷することを防止できる。 By providing the through hole 15a in the external conductive member 15, there is no gap between the external conductive member 15 and the flange portion 9a of the negative electrode terminal 9 when the external conductive member 15 and the negative electrode terminal 9 are connected by welding. Since it can be confirmed, the welded portion 63 can be stably formed. Therefore, the welded portion 63 can be reliably controlled so as not to reach the second region 102 of the negative electrode terminal 9.
Further, by forming the welded portion 63 on the thin portion 15b of the external conductive member 15, it is possible to reliably control the welded portion 63 so as not to reach the second region 102 of the negative electrode terminal 9. The thickness of the thin portion 15b is preferably smaller than the height of the protrusion 9d.
The thickness of the outer conductive member 15 (thickness around the thin portion 15b) is preferably larger than the height of the protrusion 9d. With such a configuration, it is possible to prevent the weld 63 from coming into contact with other members or the like and damaging the weld 63.

接続部９ｂにおいて、径方向（図５においては左右方向）において最も第２領域１０２の厚みが小さい部分の第２領域１０２の厚みＴ２は、０．１ｍｍ以上であることが好ましい。これにより、接続部９ｂから第１領域１０１が露出することを確実に防止できる。なお、接続部９ｂから第１領域１０１が露出した場合、第１領域１０１が非水電解質により腐食する虞がある。
接続部９ｂにおいて、径方向において最も第２領域１０２の厚みが小さい部分の第２領域１０２の厚みＴ２は、０．５ｍｍ以下であることが好ましい。これにより、接続部９ｂにおける第１領域１０１が占める割合を大きくできるため溶接部６３が第２領域１０２に達することを効果的に防止できる。 In the connecting portion 9b, the thickness T2 of the second region 102, which is the portion where the thickness of the second region 102 is the smallest in the radial direction (the horizontal direction in FIG. 5), is preferably 0.1 mm or more. This can surely prevent the first region 101 from being exposed from the connecting portion 9b. When the first region 101 is exposed from the connecting portion 9b, the first region 101 may be corroded by the non-aqueous electrolyte.
In the connecting portion 9b, the thickness T2 of the second region 102 at the portion where the thickness of the second region 102 is smallest in the radial direction is preferably 0.5 mm or less. As a result, the proportion of the first region 101 in the connecting portion 9b can be increased, so that the welding portion 63 can be effectively prevented from reaching the second region 102.

負極端子９の接続部９ｂの中央部において、第２領域１０２の中心軸９ｘが延びる方向における厚みＴ３は、０．６ｍｍ以上であることが好ましい。これにより、負極端子９の導電性を向上させることができる。よって、より出力特性に優れた二次電池となる。また、負極端子９の発熱を抑制できるため、外部側絶縁部材１３の劣化を抑制できる。 In the central portion of the connecting portion 9b of the negative electrode terminal 9, the thickness T3 in the direction in which the central axis 9x of the second region 102 extends is preferably 0.6 mm or more. Thereby, the conductivity of the negative electrode terminal 9 can be improved. Therefore, the secondary battery has more excellent output characteristics. Further, since the heat generation of the negative electrode terminal 9 can be suppressed, the deterioration of the outer insulating member 13 can be suppressed.

図６は、封口板２の短手方向に沿った負極端子９近傍の断面図である。なお、図６では、負極端子９と外部導電部材１５のみを記載している。 FIG. 6 is a cross-sectional view of the vicinity of the negative electrode terminal 9 along the lateral direction of the sealing plate 2. In FIG. 6, only the negative electrode terminal 9 and the external conductive member 15 are shown.

図７は負極端子９と外部導電部材１５の近傍の平面図である。溶接部６３は、負極端子９の中心軸９ｘから径方向において複数列形成されていることが好ましい。溶接部６３が渦巻き状に形成することができる。封口板２の長手方向において、溶接部６３が形成される位置は負極端子９の中心軸９ｘから封口板２の中央部側（ガス排出弁２１側）にずれた位置に形成されていることが好ましい。これにより、より低抵抗な二次電池となる。 FIG. 7 is a plan view of the vicinity of the negative electrode terminal 9 and the external conductive member 15. The welded portions 63 are preferably formed in a plurality of rows in the radial direction from the central axis 9x of the negative electrode terminal 9. The welded portion 63 can be formed in a spiral shape. In the longitudinal direction of the sealing plate 2, the position where the welded portion 63 is formed is formed at a position deviated from the central axis 9x of the negative electrode terminal 9 toward the central portion side (gas discharge valve 21 side) of the sealing plate 2. preferable. As a result, the secondary battery has a lower resistance.

なお、第２領域１０２の表面にニッケルからなるニッケル層を設けてもよい。 A nickel layer made of nickel may be provided on the surface of the second region 102.

フランジ部９ａの側面に配置された境界１０３は外部側絶縁部材１３に覆われていることが好ましい。このような構成によると、結露等により水分が負極端子９近傍に生じた場合、アルミニウム又はアルミニウム合金からなる第１領域１０１と、銅又は銅合金からなる第２領域１０２とに跨って水滴ないし水膜が存在する状態となることを防止できる。よって、アルミニウム又はアルミニウム合金からなる第１領域１０１の腐食を抑制できる。 The boundary 103 arranged on the side surface of the flange portion 9a is preferably covered with the outer insulating member 13. With such a configuration, when water is generated near the negative electrode terminal 9 due to dew condensation or the like, water droplets or water are spread across the first region 101 made of aluminum or aluminum alloy and the second region 102 made of copper or copper alloy. It is possible to prevent the film from existing. Therefore, the corrosion of the first region 101 made of aluminum or aluminum alloy can be suppressed.

封口板２の短手方向におけるフランジ部９ａの長さに対する肉厚部９ｅの長さの割合は、封口板２の長手方向におけるフランジ部９ａの長さに対する肉厚部９ｅの長さの割合よりも大きいことが好ましい。 The ratio of the length of the thick portion 9e to the length of the flange portion 9a in the lateral direction of the sealing plate 2 is calculated from the ratio of the length of the thick portion 9e to the length of the flange portion 9a in the longitudinal direction of the sealing plate 2. Is also preferably large.

[組電池]
図８は、二次電池５０を複数個含む組電池５００の平面図である。一つの二次電池５０の外部導電部材１４と他の二次電池５０の外部導電部材１５が、バスバー５０１により電気的に接続されている。外部導電部材１４とバスバー５０１はボルト部１６とナット５０２により締結接続されている。外部導電部材１５とバスバー５０１はボルト部１７とナット５０２により締結接続されている。なお、バスバー５０１は金属製あることが好ましく、アルミニウム又はアルミニウム合金製であることが好ましい。 [Battery pack]
FIG. 8 is a plan view of an assembled battery 500 including a plurality of secondary batteries 50. The external conductive member 14 of one secondary battery 50 and the external conductive member 15 of another secondary battery 50 are electrically connected by a bus bar 501. The external conductive member 14 and the bus bar 501 are fastened and connected by a bolt portion 16 and a nut 502. The external conductive member 15 and the bus bar 501 are fastened and connected by the bolt portion 17 and the nut 502. The bus bar 501 is preferably made of metal, and is preferably made of aluminum or aluminum alloy.

[他の組電池]
上述の実施形態に係る二次電池５０及び組電池５００においては、正極端子７に接続された外部導電部材１４と、負極端子９に接続された外部導電部材１５とを、バスバー５０１により接続する例を示した。一方の二次電池５０の正極端子７と他方の二次電池５０の負極端子９を、バスバーにより直接接続することができる。 [Other batteries]
In the secondary battery 50 and the assembled battery 500 according to the above-described embodiment, an example in which the external conductive member 14 connected to the positive electrode terminal 7 and the external conductive member 15 connected to the negative electrode terminal 9 are connected by the bus bar 501. showed that. The positive electrode terminal 7 of one secondary battery 50 and the negative electrode terminal 9 of the other secondary battery 50 can be directly connected by a bus bar.

図９に示す組電池６００では、正極端子７と負極端子９にそれぞれバスバー６０１が直接接続されている。バスバー６０１は貫通孔６０１ａを有し、バスバー６０１は貫通孔６０１ａの周囲に他の部分よりも厚みの小さい薄肉部６０１ｂを有する。バスバー６０１は、薄肉部６０１ｂにおいて、正極端子７と負極端子９にそれぞれ溶接され、溶接部６０２が形成されている。バスバー６０１と封口板２の間には樹脂製の絶縁部材６０３が配置されている。 In the assembled battery 600 shown in FIG. 9, the bus bar 601 is directly connected to each of the positive electrode terminal 7 and the negative electrode terminal 9. The bus bar 601 has a through hole 601a, and the bus bar 601 has a thin portion 601b having a smaller thickness than other portions around the through hole 601a. The bus bar 601 is welded to the positive electrode terminal 7 and the negative electrode terminal 9 at the thin portion 601b to form a welded portion 602. An insulating member 603 made of resin is arranged between the bus bar 601 and the sealing plate 2.

[その他]
負極端子９において第１領域１０１と第２領域１０２の間にニッケル層を配置してもよい。この場合、ニッケル層が境界１０３に存在することになる。 [Other]
A nickel layer may be arranged between the first region 101 and the second region 102 in the negative electrode terminal 9. In this case, the nickel layer exists at the boundary 103.

５０・・・二次電池
２００・・・電池ケース
１・・・外装体
２・・・封口板
２ａ・・・正極端子取り付け孔
２ｂ・・・負極端子取り付け孔
３・・・巻回電極体
４・・・正極芯体露出部
５・・・負極芯体露出部
６・・・正極集電体
７・・・正極端子
８・・・負極集電体
９・・・負極端子
９ａ・・・フランジ部
９１・・・第１面
９２・・・第２面
９３・・・側面
９ｂ・・・接続部
９ｃ・・・凹部
９ｄ・・・突部
１０１・・・第１領域
１０２・・・第２領域
１０３・・・境界
９ｅ・・・肉厚部
９ｘ・・・中心軸
１０、１１・・・内部側絶縁部材
１２、１３・・・外部側絶縁部材
１４、１５・・・外部導電部材
１５ａ・・・貫通孔
１５ｂ・・・薄肉部
１６、１７・・・ボルト部
１８、１９・・・絶縁部材
２０・・・絶縁シート
２１・・・ガス排出弁
２３・・・封止部材

６０、６１、６２、６３・・・溶接部

５００・・・組電池
５０１・・・バスバー
５０２・・・ナット
６００・・・組電池
６０１・・・バスバー
６０１ａ・・・貫通孔
６０１ｂ・・・薄肉部
６０２・・・溶接部
６０３・・・絶縁部材 50... Secondary battery 200... Battery case 1... Exterior body 2... Sealing plate 2a... Positive electrode terminal mounting hole 2b... Negative electrode terminal mounting hole 3... Winding electrode body 4 ...Exposed portion of positive electrode core 5...Exposed portion of negative electrode core 6...Positive electrode collector 7...Positive electrode terminal 8...Negative electrode collector 9...Negative electrode terminal 9a...Flange Part 91... 1st surface 92... 2nd surface 93... Side surface 9b... Connection part 9c... Recessed part 9d... Projection part 101... 1st area|region 102... 2nd Area 103... Boundary 9e... Thick portion 9x... Central axis 10, 11... Inner insulating member 12, 13... Outer insulating member 14, 15... External conductive member 15a. ..Through hole 15b...Thin portion 16,17...Bolt portion 18,19...Insulating member 20...Insulating sheet 21...Gas discharge valve 23...Sealing member

60, 61, 62, 63... Welded part

500...Battery pack 501...Bus bar 502...Nut 600...Battery pack 601...Bus bar 601a...Through hole 601b...Thin wall part 602...Welding part 603...Insulation Element

Claims (8)

正極板と負極板を含む電極体と、
開口を有し、前記電極体を収容する外装体と、
前記開口を封口する封口板と、
前記正極板又は前記負極板に電気的に接続された端子と、を備えた二次電池であって、
前記封口板は端子取り付け孔を有し、
前記端子は、第１面と前記第１面とは反対側に位置する第２面とを有するフランジ部と、前記第１面に設けられた接続部を有し、
前記接続部は前記端子取り付け孔に挿入され、
前記端子は、アルミニウム又はアルミニウム合金からなる第１領域と、銅又は銅合金からなる第２領域を有し、
前記フランジ部において、前記第１面側に前記第２領域が配置され、前記第２面側に前記第１領域が配置され、
前記第１領域と前記第２領域の境界の少なくとも一部が前記第１面と前記第２面の間に配置され、
前記フランジ部において、前記フランジ部の厚み方向における前記第１領域の厚みが最も小さい部分の前記第１領域の厚みが０．３ｍｍ以上であり、
前記フランジ部上にアルミニウム又はアルミニウム合金製の外部導電部材が配置され、
前記外部導電部材が前記フランジ部に溶接されて溶接部が形成された二次電池。 An electrode body including a positive electrode plate and a negative electrode plate,
An exterior body having an opening and accommodating the electrode body,
A sealing plate for sealing the opening,
A secondary battery comprising a terminal electrically connected to the positive electrode plate or the negative electrode plate,
The sealing plate has a terminal mounting hole,
The terminal has a flange portion having a first surface and a second surface located on the side opposite to the first surface, and a connection portion provided on the first surface,
The connection portion is inserted into the terminal mounting hole,
The terminal has a first region made of aluminum or an aluminum alloy and a second region made of copper or a copper alloy,
In the flange portion, the second region is arranged on the first surface side, and the first region is arranged on the second surface side,
At least a part of a boundary between the first area and the second area is arranged between the first surface and the second surface,
In the flange portion, the thickness of the first region in the portion where the thickness of the first region in the thickness direction of the flange portion is the smallest is 0.3 mm or more,
An external conductive member made of aluminum or aluminum alloy is arranged on the flange portion,
A secondary battery in which the external conductive member is welded to the flange portion to form a welded portion. 前記接続部において前記端子取り付け孔内に配置される部分では、前記第１領域よりも前記第２領域が前記接続部の径方向の外側に位置し、
前記接続部において前記端子取り付け孔内に配置される部分において、前記接続部の径方向における前記第２領域の厚みが最も小さい部分の前記第２領域の厚みは０．１ｍｍ以上である請求項１に記載の二次電池。 In the portion of the connecting portion arranged in the terminal mounting hole, the second region is located outside the first portion in the radial direction of the connecting portion,
The thickness of the second region in the portion of the connection portion arranged in the terminal mounting hole, in which the thickness of the second region is smallest in the radial direction of the connection portion, is 0.1 mm or more. The secondary battery according to. 前記接続部において、前記境界は中央が前記第２面側に突出する凸状に形成されており、
前記凸状に形成された前記境界において中央に形成される前記第２領域の厚みが最も大きい部分の前記第２領域の厚みは０．６ｍｍ以上である請求項１又は２に記載の二次電池。 In the connection portion, the boundary is formed in a convex shape whose center projects toward the second surface side,
The secondary battery according to claim 1 or 2, wherein the thickness of the second region, which is the largest thickness of the second region formed at the center of the boundary formed in the convex shape, is 0.6 mm or more. .. 前記外部導電部材にボルト部が形成された請求項１〜３のいずれかに記載の二次電池。 The secondary battery according to claim 1, wherein a bolt portion is formed on the external conductive member. 前記外部導電部材はバスバーである請求項１〜３のいずれかに記載の二次電池。 The secondary battery according to claim 1, wherein the external conductive member is a bus bar. 前記外部導電部材は薄肉部を有し、
前記薄肉部が前記フランジ部に溶接されて前記溶接部が形成された請求項１〜５のいずれかに記載の二次電池。 The external conductive member has a thin portion,
The secondary battery according to claim 1, wherein the thin portion is welded to the flange portion to form the welded portion. 前記溶接部は複数列形成された請求項１〜６のいずれかに記載の二次電池。 The secondary battery according to claim 1, wherein the welded portions are formed in a plurality of rows. 請求項１〜７のいずれかに記載の二次電池を複数含む組電池。

An assembled battery including a plurality of the secondary batteries according to claim 1.

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